Today (3/14) is Pi Day, a hallowed celebration in which radius and circumference lovers everywhere convene to eat circular pastries and challenge each other to decimal-reciting contests. Score your festivities with the awesomely underrated soundtrack to Darren Aronofsky's Pi.

The 1998 soundtrack not only launched Clint Mansell's film composing career; it also acts as a veritable who's who for electronic music at the end of the 20th century. It's kind of incredible how this indie movie with a budget of less than $1 million managed to attract such heavyweight talent as Aphex Twin, Massive Attack, Orbital, and Autechre. In the spirit of Pi Day, we've posted a retrospective of the soundtrack below. On second thought, you better not spin this at your Pi Day Party. It'll just fill your guests with profound psychological dread and perhaps inspire some impromptu self-trepanations.

1.) Clint Mansell - "πr²"

2.) Orbital - "P.E.T.R.O.L"

3.) Autechre - "Kalpol Intro"

4.) Aphex Twin -"Bucephalus Bouncing Ball"

5.) Roni Size - ""Watching Windows" (Ed Rush & Optical remix)

6.) Massive Attack - "Angel"

7.) Clint Mansell - "We've Got The Gun"

8.) Dave Holmes - "No Man's Land"

9.) GusGus - "Anthem" (PS: The below music video splices this song with Akira footage. Nice!)